Yeah. When I want to carry spare batteries, I use this case. I got this at Fryes Electronics for $19.99. It came as part of a kit with a camera cleaner, screen protectors, a mini-tripod, and the case. It's from an Olympus Digital Camera Starter Kit.

Thanks for the help MPVRr!!! I'm going to get 2 of them from ebay, onefor my daughters 5900 and my mpvr. I just got mine today!!! I have the battery charging so I didn't get a chance to play with it yet. I'll be sure to upload some vids and pics as soon I get some.